Engine vibration eliminator



April 23, 1940- J. L. STRASBURG ET AL 2,193.135

ENGINE VIBRATION ELIMINATOR Filed Nov. 15, 1958 2 Sheets-Sheet lInvenlaz's.

Attarny April 1940- J. L. STRASBURG ET AL. 2,198, 35

ENGINE VIBRATION ELIMINATOR Filed NOV. 15, 1938 2 Sheets-Sheet 2 JL.Straw!) 21119, E J Livingston G. (1' B i Zlm an Inventors. by W A #01222ey Patented Apr. 23, 1940 UNITED STATES PATENT OFFICE ENGINE VIBRATIONELIMINATOR Jesse L. Strasbnrg, South Wiiliamsport, Frederick J.Livingston. Wiiliamsport, and George 0. Billman, Jersey Shore, Pa.

Application November 15, 1938, Serial No. 240,596 1: Claims. (Cl.14-574) This invention relates to engine vibration surface 4, theinnermost cylindrically convex wall eliminators and has for its objectto provide a surface 5, and the flat Wall S rfa e last f constructionwhich is simple in parts and more which surfaces lies in a planesubstantially at efficient in operation than those heretofore prorightangles to the common axis of the cylindrical posed. surfaces. A coverplate I. provided to close the with these and other objects in view theinchamber 3, may be secured in any suitable ventlon resides in the noveldetails of construcfashion. tion and combinations of parts as will bedis- Within the chamber there isprovided a pluralclosed more fullyhereinafter and particularly y of segmental weights in of any ui a l mpointed out in the claims. separated from each other by a plurality of10 Referring to the accompanying drawings iormresilient spacers H, whichspacers also separate ing a part or this specification and in which likethe weights from the outermost and innermost numerals designate likeparts in all the views-- cylindrical urf es 4 an 5 respeetiv ly- E hFig. 1 is a vertical sectional view of a device weight is formedsubstantially as shown in that made in accordance with this invention asapeach is of an acruate extent substantially no 5 plied to a pulley,said view taken as on th line greater than the radius of the outermostcylindril-l of Fig. 2 and looking in the direction of the cal surface ofsaid chamber, wherefore a miniarrows; mum of six weights may be providedin the smal- Fig. 2 is a sectional view taken as on the line ler sized cambe s; lar er chambers ay have e 2-2 of Fig. 1 and looking in thedirection of the reate number of wei hts as found most de- 20 arrows;sirable. Each segmental weight has outer and Fig. 3 is an enlargedtransverse sectional view inner ylin ri al rf which ar Substantiallytaken as on the line 3-3 of Fig. 1 and looking in co xi with t e sponurfaces of the the direction of the arrows; chamber, each weight is of athickness to provide Fig. 4 is a perspective view illustrating one suchclearance with the flat surface 6 and the of the segmental weights shownin Fig. 1; cover plate I as to permit movement of the weight Fig. 5 is asimilar perspective view of a modiradially f the am r. each weight is ofa fled form of segmental weight; radial dimension less than thecorresponding Fig. 6 is a sectional view taken as on the lin dimensionof the chamber, and further each H of Fig. 7 and looking in thedirection of the weight is formed with its corners cut out or rabarrows,and illustrates the employment of the beted to form a pocket or recessfor receiving a 80 modified segmental weight shown in Fig. 5; corner ofa rectangular spacer H, as clearly in- Flg. 7 is a vertical sectionalview taken as on dlcated in la 1, l f Such Pockets being of the line llof Fig. 6 and looking in the direction stantially the same shape anddimension so that of the arrows; and no particular spacer is requiredfor any one 35 Fig. 8 is a perspective view illustrating a modip ke nher Words h pacers may be interiied form of spacer for use with thesegmental h n eable. weight shown in Fig. 5, The size of each spacer issuch that it will ex- The device of this invention is designed for tendout of its p k n One direction beyond the application to engines orother mechanisms in cylindrical surface of its associated weight, and 0which objectionable vibrations occur, and tends this extent is suchthat, when the W i hts and to substantially eliminate such objectionablevithe spacers are assembled in the chamber 3, the brations, resulting ina smoother operation of spacer W l be er pres i n in a. direction themotor or mechanical part. Therefore the r di f the Chamber y ll upporthe invention is applicable to various parts of meweig ts in spacedrelation to the cylindrical mm 45 chanical structures but, for thepurpose only of faces of the chamber. illustration, it is shown here asused in connection Further, another dimension of each spacer is withafan pulley intended to be mounted upon more than twice the depth of therabbet or an automobile engine shaft. pocket formed in the weightswherefore, when all The shaft is indicated by the numeral I and of theweights and spacers are correctly askeyed or otherwise secured theretois the pulley sembled, each spacer will be under compression generallyidentified by the numeral 2, but this in a direction circumferential ofsaid chamber pulley has attached thereto or formed in a face and theadjacent ends of the weights will 'be thereof an annular chamberindicated at 3 and spaced from each other. Additionally, the thirdhaving the outermost cylindrical concave wall dimension of each spaceris slightly greater than 55 the distance from the cover plate 1 to theflat surface 6 of said chamber wherefore, when the cover plate issecured in place. the spacers will be compressed and this compressionwill have resultants in both circumferential and radial directions.Obviously, the best results may be had when using spacers of uniform orhomogeneous composition so that compression in three directions is madepossible and hence some elastic- From Fig. 1 it will be perfectlyobvious why there is no metal .to metal contact in circumferential orradial directions, and in Fig. 3 the side clearances have been shown at[2' and I3. In other words the thickness of each weight is such as topermit a clearance of approximately ,6 of an inch on each side thereofwith the surface 6 of the chamber and with the cover plate 1, whichclearance is maintained during the operation of the device. In fact, thecompression of the spacers is sufliciently great to cause a bulge todevelop at the spaces between the adjacent ends of the weights (as atI4), as well as develop at the spaces between the cylindrical surfacesof the weights and the chamber (as at l5), and develop atsaid clearances(as at It). Preferably the spacers II which are farthest from the axisof the pulley should have more resistance than those nearer said axisand, whereas this is indicated in the drawings by the difference only inweight of the cross-hatching, yet it is to be understood that thisinvention is not limited to the exact construction illustrated since anytype of spacers is contemplated wherein the outermost will offer agreater resistance than the innermost to relative movement between thechamber and its contained weights, and this difference in resistance maybe variously accomplished.

In some'cases positive insurance of this free floating may be desiredand therefore the construction shown in Figs. 5 to 8 is contemplated.

7 Here a segmental weight 20 is shown which is a duplicate of the weightIn heretofore described except that midway of each extreme end there isprovided a slot or kerf 2| disposed in a plane parallel to the flatsides of the weight and thereby joining the two f bbets or pockets at anend of the weight. A resilient spacer 22 is provided which is aduplicate of the spacer ll except that across one face thereof thereextends a rib 23 midway from the ends, and this rib is adapted to engagethe kerfs such as 2| in the ends of twoadjacent weights. At the junctureof each pair of segmental weights, one or both of the spacers may beprovided with such a rib, as found neces-' sary in accordance with thesize, weight and speed factors involved. With the employment of suchcoacting ribs and kerfs, the segments will be positively spaced from theflat surface 8 and the cover plate I to insure no contact therewith.

From what has been described above it will now be seen that thevibrations are dissipated presumably as follows. The vibration of anengine shaft has a period which is automatically transmitted to allparts associated with that shaft and therefore such period of vibrationis transmitted through the pulley 2 and the spacers ll into thesegmental weights l0. However, when this occurs, the continuity of thisperiod of vibration is broken up so that all of the segmental weights donot absorb the same vibratory deflection and consequently the inertiasof said weights dampen or iron-out the objectionable period ofvibration. In other words, if instead of separated segments l0 there wasprovided a continuous metallic ring, there would be no dampening orironing-out because the period of vibration transmitted into any oneportion of such ring would automatically and instantaneously betransmitted into all the other parts of that ring. By providing theplurality of spaced segmental weights which are in no metallic contactwith each other, the deflection of any one segment is substantiallyindependent of the deflection 'of another segment, and the resilientspacers aid materially in absorbing a portion of the vibrationtransmitted to any one segment and prevent the full transmission thereofto the next segment while permitting the free and independent movementof each segment.

When this device is assembled and the engine shaft starts to rotate,immediate rotation is given to the pulley, and substantially immediaterotation is given to the segmentalweight assembly, although it may betrue that the weights might have a slight lag over the rotary movementof the pulley, but this lag would exist only in the initial movement. Inother words the only differential between the weight assemblage and thepulley is that which is made possible by the .resiliency of theseparators and, by the time the shaft reachesits intended speed, thisdifferential for practical considerations becomes zero. Theaforementionedlag does not result in any creep of the separators withrespect to the cylindrical surfaces with which they are in contact, theavoidance of such creep being due to the compression in all threedimensions under which the separators are placed in the assemblage,which compression is caused by what might be termed the "over-size" ofthe separators with respect to the spaces they occupy.

From the foregoing description it will therefore be understood that bythis invention there is provided a vibration eliminator particularlyadaptable to engines or other motors and wherein there is provided achamber, with a weight in said chamber, and means for spacing saidweight from the walls of said chamber. In the more specific aspect ofthe invention the chamber is annular and provided with a plurality of.weights, which weights are segmental in character and similar to eachother, and provided with a rabbet at each of its end edges, all of therabbets of each weight being similar, the rabbets of each weightregistrable with the rabbets of the next adjacent weight. In addition,the means for spacing the weights from each other as well from the wallsof the chamber, are resilient means disposed between the ends of theweights and operating upon the corners or other portions thereof, saidmeans coacting with said rabbets and fitting each pair of registeredrabbets under compression but of such dimensions as to extend beyond thelimits or the rabbets. In the most limited sense, the spacing means is aresilient member having a rib engageable with the registered slots whichinterconnect the two rabbets at each end of a weight.

It is obvious that those skilled in the art may vary the details ofconstruction and arrangements of parts without departing from the spiritof this invention, and therefore it is desired not to be limited to theexact foregoing disclosure except as may he demanded by the claims.

What is claimed is:

1. In a device of the character described the combination of an annularchamber; a plurality of similar segmental weights in said chamber, eachweight having a rabbet disposed at each of its end edges, all of therabbets of each weight being similar, the rabbets of each weightregistrable with the rabbets of the next adjacent weight; and means forspacing said weights from each other and from the walls of said chamber,said means comprising a resilient member fitting each pair of registeredrabbets and extending beyond the limits thereof.

2. In a device of the character described the combination of an annularchamber; a plurality of similar segmental weights in said chamber; eachweight having a rabbet disposed at each of its end edges, the tworabbets at each end of a weight being interconnected by a slot, all ofthe rabbets of each weight being similar, the rabbets and slots of eachweight registrable with the rabbets and slots of the next adjacentweight; and means for spacing said weights from each other and from thewalls of said chamber, said means comprising a resilient member fittingeach pair of registered rabbets and extending beyond the limits thereof,each member having a rib engaging the registered slots.

3. In a device of the character described the combination of an annularchamber; a plurality of segmental weights in said chamber, each weighthaving a rabbet disposed at each of its end edges, the rabbets of eachweight registrable with the rabbets of the next adjacent weight; andmeans for spacing said weights from each other and from the walls ofsaid chamber, said means comprising a resilient member disposed in eachpair of registered rabbets and having a portion extending beyond thelimits thereof.

4. In a device of the character described, the combination of an annularchamber; a plurality of segmental weights in said chamber, each weighthaving a recess disposed in each end thereof, the recesses of eachweight registrablewiththe recesses of the next adjacent weights; andmeans for spacing said weights from each other and from the walls ofsaid chamber, said means comprising a resilient member disposed in eachpair of registered recesses and having a portion extending beyond thelimits thereof and contacting the walls of said chamber.

5. In a device of the character described the .combination of an annularchamber; a plurality of segmental weights in said chamber; and means forspacing said weights from each other and from the walls of said chamber,said means comprising a resilient member disposed at the adjoining endsof two adjacent weights, said membetween such adjoining ends and havingother portions extending beyond the limits of such two weights and insurface contact with walls of said chamber.

7. In a device of the character described the combination of an annularchamber; a plurality of segmental weights in said chamber; and means forspacing said weights from each other and from the walls of said chamber,said means comprising a plurality of resilient members, each memberdisposed at the adjoining corners of two adjacent weights, the outermostmembers having a resiliency different from the resiliency of theinnermost members.

8. In a device'of the character described the combination or an annularchamber; a plurality of segmental weights in said chamber; and means forspacing said weights from the outermost surface of said chamber, saidmeans comprising a plurality of resilient members, each member disposedat the adjoining corners of two adjacent weights and extending beyondthe limits thereof to contact the outermost surface of said chamber, theoutermost members having a lesser resiliency than the innermost members.

9. In a device of the character described the combination of an annularchamber; a plurality of recessed segmental weights in said chamber; andresilient means engaging the registered recesses of and operating uponthe corners of the weights for spacing said weights from each other andfrom the walls of said chamber, said means comprising members theoutermost of which has a resiliency different from the resiliency of theinnermost members.

10. In a device of the character described the combination of arotatable chamber; a plurality of weights in said chamber, said weightscollectively substantially filling the space of said chamber but movablein said chamber during rotation thereof,,each weight having a recessextending inwardly from its outermost surface; and means for spacingsaid weights from the outermost surface of said chamber, said meanscomprising a resilient member engaging said recess and extending beyondthe limits thereof to contact the outermost surface of said chamber.

11. In a device of the character described the combination of arotatable chamber; a weight in said chamber, said weight substantiallyfilling the space of said chamber but movable in said chamber duringrotation thereof, said weight having recesses extending inwardly fromits outermost and innermost surfaces; and means for spacing said weightfrom the outermost and innermost walls of said chamber, said meanscomprising a plurality of resilient members engaging said recesses andextending beyond the limits thereof to contact the outermost andinnermost surfaces of said chamber.

12. In a device of the character described the combination of an annularchamber; a plurality of segmental weights in said chamber, each weighthaving a recess disposed in each end thereof, the recesses of eachweight registrable with the recesses of the next adjacent weights; andmeans for spacing said weights from the outermost surface of saidchamber, said means comprising a resilient member disposed in each pairof registered recesses and extending beyond the limits thereof tocontact the outermost surface of said chamber. 7

13. In a device of the character described the combination of an annularchamber; a plurality of segmental weights in said chamber, each weight 4a,1os,1as having recesses extending inwardly from all races ingtherebeyond bearing against the walls of said thereof; and means forsupporting said weights out 01' contact with each other as well as outof contact with any portion of said chamber, said means comprisingspaced resilient members engaging said recesses and having portionsextendchamber.

JESSE L. STRABB URG. FREDERICK J. LIVINGSTON. GEORGE C.

